Previously we looked at evidence of a dulling substance in use on on one of the mantel statues  on I Love lucy.  An anti-reflective coating is used when needed to reduce glare for the cameras. Above on the left is a instance from Little Ricky Learns to Play Drums where the cream colored Olde Thompson  ivy cruet has been darkened sufficiently to appear gray in tone.  The picture to the right is from an earlier episode where the same cruet appears lighter.
Here is an example of the same make Olde Thompson cruet in its original state.